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Leases

6 Months Ended

Jun. 30, 2021

The Company has operating leases for corporate offices, research and development facilities and manufacturing facilities. We determine if an arrangement is a lease at inception. Operating leases are included in right-of-use ("ROU") assets and liabilities.

The components of lease expense were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Operating lease cost:
Amortization of right-of-use assets	$	1.5	$	1.0	$	2.8	$	2.1
Interest on lease liabilities	0.3		0.3		0.7		0.6
Total operating lease cost	$	1.8	$	1.3	$	3.5	$	2.7

Operating lease costs are reflected as components of cost of product sales and contract development and manufacturing services, research and development expense and selling, general and administrative expense.

Supplemental balance sheet information related to leases was as follows:


(In millions, except lease term and discount rate)	Balance Sheet location	June 30, 2021			December 31, 2020
Operating lease right-of-use assets	Other assets	$	29.6		$	31.0

Operating lease liabilities, current portion	Other current liabilities	5.7			5.4
Operating lease liabilities	Other liabilities	25.9			27.8
Total operating lease liabilities		$	31.6		$	33.2

Operating leases:
Weighted average remaining lease term (years)		7.2			7.7
Weighted average discount rate		4.0		%	4.1		%